HTV-1
HTV-1 before berthing
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| Mission type | ISS resupply |
|---|---|
| Operator | JAXA |
| COSPAR ID | 2009-048A |
| SATCAT no. | 35817 |
| Spacecraft properties | |
| Spacecraft type | HTV |
| Start of mission | |
| Launch date | 10 September 2009, 17:01:46 UTC |
| Rocket | H-IIB |
| Launch site | Tanegashima Yoshinobu-2 |
| Contractor | Mitsubishi |
| End of mission | |
| Disposal | Deorbited |
| Decay date | 1 November 2009, 21:26 UTC |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Inclination | 51.6 degrees |
| Berthing at ISS | |
| Berthing port | Harmony nadir |
| Berthing date | 17 September 2009, 22:26 UTC |
| Unberthing date | 30 October 2009, 15:02 UTC |
| Time berthed | 43 days |
| Cargo | |
| Mass | 4,500 kilograms (9,900 lb) |
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HTV-1, also known as the HTV Demonstration Flight or HTV Technical Demonstration Vehicle, was the first Japanese Space Agency (JAXA) H-II Transfer Vehicle, launched in September 2009 to resupply the International Space Station and support the JAXA Kibo (きぼう, Kibō?, Hope) laboratory or JEM. It was an unmanned cargo spacecraft carrying a mixture of pressurised and unpressurised cargo to the space station. After a 52-day successful mission, HTV departed the ISS on 31 October 2009 after being released by the station's robotic arm. The spacecraft re-entered the Earth's atmosphere on 2 November and disintegrated on re-entry as planned.
HTV-1 carried four and a half tonnes of payload, lower than the six tonne maximum payload of the HTV in order to allow the spacecraft to carry additional propellant and batteries for the in-orbit verification phase of the flight.
In the Unpressurised Logistics Carrier, the HTV-1 carried SMILES (Superconducting Submillimetre-Wave Limb Emission Sounder) and HREP (HICO-RAIDS Experiment Payload), which both were installed in the JEM Exposed Facility on the ISS. The Pressurised Logistics Carrier carried 3.6 tonnes of supplies for the International Space Station. It consisted of food (33% of weight), laboratory experiment materials (20%), robot arm and other hardware for JEM (18%), crew supplies including garments, toiletries, personal mail and photographs, fluorescent lights, waste buckets (10%), and packing materials (19%).
HTV-1 was launched on the maiden flight of the H-IIB carrier rocket. The H-IIB 304 configuration was used, with a type 5S-H payload fairing. Before launch, two Captive Firing Tests were conducted on the rocket which was to launch HTV-1. The first test, which consisted of firing the first stage for ten seconds, was originally scheduled to occur at 02:30 UTC on 27 March 2009, however it was cancelled after the launch pad's coolant system failed to activate. This was later discovered to have been due to a manual supply valve not being open. The test was rescheduled for 1 April, but then postponed again due to a leak in a pipe associated with the launch facility's fire suppression system. The test was rescheduled for 2 April, when it was successfully conducted at 05:00 UTC. Following this, the second test, which involved a 150-second burn of the first stage, was scheduled for 20 April. This was successfully conducted at 04:00 UTC on 22 April, following a two-day delay due to unfavourable weather conditions. A ground test, using a battleship mockup of the rocket was subsequently conducted on 11 July.
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